
    function model() {
    var obj = document.querySelector(".model"),
          t = obj.innerText;
    if(t == "") {obj.innerText = arguments[0]}
    obj.classList.add("m_show");
    setTimeout(function() {
        obj.classList.remove("m_show");
        if(t == ""){obj.innerText = "";}
        }, 2000)
    }